'Forbidden Planet' found by astronomers in Neptunian Desert

Exoplanets have been making waves over the last 20 years, and now as technology advances, we may be about to meet some strange new worlds beyond our solar system.

Posted: Jul 1, 2019 9:00 PM

Updated: Jul 1, 2019 9:00 PM

Posted By: By Ashley Strickland, CNN

Astronomers have found an exoplanet so rare that they have deemed it "The Forbidden Planet," according to a new study.

Technically known as NGTS-4b, the planet is three times the size of Earth and 20% smaller than Neptune. It's also hotter than Mercury with a temperature of 1,832 degrees Fahrenheit. And the planet has its own atmosphere.

An international team of astronomers used the Next-Generation Transit Survey observing facility to spot the small rogue planet.

It's the first exoplanet like this to be found in the Neptunian Desert. To be clear, this isn't a barren region on the gaseous planet of Neptune. Instead, it's a region close to stars where Neptune-sized planets can't be found.

Here, planets are blasted with radiation from stars, so the planets can't maintain their gaseous atmosphere. They evaporate and only a rocky core is left behind.

But NGTS-4b still has its gaseous atmosphere.

Astronomers believe that either the planet moved into this region within the last million years, or the planet itself was once bigger and the atmosphere is in the process of evaporating.

"This planet must be tough - it is right in the zone where we expected Neptune-sized planets could not survive,"said Richard West in a statement, study author and principal research fellow from the University of Warwick's department of physics. "It is truly remarkable that we found a transiting planet via a star dimming by less than 0.2% - this has never been done before by telescopes on the ground, and it was great to find after working on this project for a year."